Disk Utility Icon

Unmounting a volume

If you are using an external disk that contains several volumes and you unmount one of the volumes in the Finder, all the volumes on that disk that are not in use are ejected.

Use Disk Utility to unmount only a single volume of the disk.

Select the volume you want to unmount in the list and click Unmount in the toolbar.

To mount the volume again, quit Disk Utility then open it again. Select the volume in the list and click Mount. You can also unplug an external hard disk and plug it back in again.

If you eject a volume on a removable disk, such as a CD, the disk is ejected. Insert the disk again to mount it.

See also

volumes